-778

Appears in sequences

• Expansion of Product_{k>=1} (1 - 2x^k).at n=66A070877
• Expansion of (1-x)/(1+x-x^2+x^3).at n=11A078042
• Inverse of the Delannoy triangle.at n=51A103136
• Riordan array ((1-x+sqrt(1+6*x+x^2))/2, (sqrt(1+6*x+x^2)-x-1)/2).at n=62A112477
• Expansion of (1/(1+4x-2x^2))*c(x/(1+4x-2x^2)), c(x) the g.f. of A000108.at n=5A179648
• Expansion of f(x, x^2) / psi(x)^3 in powers of x where psi(), f(, ) are Ramanujan theta functions.at n=11A258092
• Expansion of q^(-1) * psi(q) / psi(q^3)^3 in powers of q where psi() is a Ramanujan theta function.at n=33A258093
• Expansion of 1 - 2*x - 2*x^2/(1 - 3*x - 4*x^2/(1 - 4*x - 6*x^2/(1 - 5*x - 8*x^2/(1 - 6*x - 10*x^2/(...))))), a continued fraction.at n=6A292831
• a(n) = 2*1 - 4*3 + 6*5 - 8*7 + 10*9 - 12*11 + 14*13 - 16*15 + ... - (up to the n-th term).at n=40A319885
• G.f.: (1/(1 + x)) * Product_{k>=1} 1/(1 + x^prime(k)).at n=49A338826